矿区地表非连续变形边界提取算法

发布时间：2018-05-08 11:05

本文选题：开采沉陷 + 非连续变形　；参考：《金属矿山》2017年11期

【摘要】：地下开采易造成地表产生裂缝、塌陷坑等非连续变形。针对开采沉陷地表预计点生成的三角网无法自动提取地表非连续破坏边界的问题,将开采沉陷预计与有限单元法相结合来判断地表断裂三角形,提出了一种基于断裂三角网的矿区地表非连续变形边界提取算法。该算法利用断裂三角网边与点的拓扑属性以及断裂三角网边界仅有一个邻接三角形的特性,以多边形凸点为起始点,按最大右角准则搜索边界点,顺时针提取多边形的内、外边界线,若当前边界点与初始点重合且前一个边界点与非极值点重合,则提取出一个边界,经过多次循环从而可提取出采区上方的地表非连续变形边界。研究表明:所提算法可有效提取出具有公共点的特殊边界与相离边界,实现断裂三角网边界一体化提取,有助于提高矿区地表非连续变形区域开采沉陷监测预计精度。
[Abstract]:Underground mining will easily lead to surface cracks, collapse pits and other discontinuous deformation. Aiming at the problem that the triangle network generated by the predicted points of mining subsidence can not automatically extract the surface discontinuous failure boundary, the mining subsidence prediction is combined with the finite element method to judge the surface fracture triangle. An algorithm for extracting discontinuous deformation boundary of mining area surface based on fault triangulation is proposed. The algorithm uses the topological properties of the edge and point of the faulted triangular network and the characteristic that the boundary of the fractured triangular network has only one adjacent triangle, taking the convex point of the polygon as the starting point, searching the boundary point according to the criterion of maximum right angle, and extracting the polygon clockwise. If the current boundary point coincides with the initial point and the former boundary point and the non-extreme point coincide, a boundary is extracted, and the surface discontinuous deformation boundary over the mining area can be extracted after several cycles. The research shows that the proposed algorithm can effectively extract the special boundary and the separated boundary with common points, and realize the integrated extraction of the boundary of fault triangle network, which is helpful to improve the prediction precision of mining subsidence monitoring in the discontinuous deformation area of mining area.
【作者单位】：江苏师范大学地理测绘与城乡规划学院;
【基金】：国家自然科学基金项目(编号:41671395,51574132)
【分类号】：TD325.2

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